Positive-parity Baryon Spectra on Isotropic Lattice
2019 May 29
We present a calculation of the low-lying spectrum for the positive-parity Delta and Nucleon using the distillation approach applied on an isotropic lattice at a pion mass of around 360 MeV. We use a non-relativistic basis of three-quark operators, together with so-called hybrid-type operators. The results are compared with lattice calculations at higher pion masses on an anisotropic lattice. The effect of varying the distillation space on the calculation is explored with the aim of obtaining stable results with a minimal number of distillation eigenvectors.